Sequence of Elements in Ammonium Sulfate Flow Chart

Steps:

• Recall ammonium sulfate formula: (NH₄)₂SO₄, containing N, H, S, O.
• Identify flow chart positions: 1 for N (from NH₃), 2 for O (from H₂SO₄), 3 for H (from both), 4 for S (from H₂SO₄).
• Match choices to numbered sequence in preparation process.
• Confirm A assigns elements correctly to positions 1-4.

Why A is correct:

• Explicitly labels elements to flow chart positions 1-4, aligning with standard preparation order from ammonia and sulfuric acid reactants.

Why the others are wrong:

• B: Lists elements without assigning to specific positions 1-4.
• C: Starts sequence with oxygen, mismatching nitrogen's initial role in ammonia.
• D: Places sulfur before hydrogen, contradicting reactant introduction order.

Final answer: A